toolStability (version 0.1.2)

genotypic_superiority_measure: Genotypic superiority measure

Description

genotypic_superiority_measure calculate variance of a genotype across environments.

Usage

genotypic_superiority_measure(
  data,
  trait,
  genotype,
  environment,
  unit.correct = FALSE
)

Value

a data table with genotypic superiority measure

Arguments

data

a dataframe containing trait, genotype and environment.

trait

colname of a column containing a numeric vector of interested trait to be analysized.

genotype

colname of a column containing a character or factor vector labeling different genotypic varieties

environment

colname of a column containing a character or factor vector labeling different environments

unit.correct

logical, default is FALSE, returning the stability index with unit equals to squared unit of trait; when TRUE, returning stability index with the unit as same as unit of trait.'

Author

Tien-Cheng Wang

Details

Genotypic superiority measure (Lin and Binns, 1988) is calculatd based on means square distance between maximum value of environment j and genotype i. Variety with low genotypic superiority measure is considered as stable. Equation of genotypic superiority measure can be found in vignette file.

References

lin1988toolStability

Examples

data(Data)
res <- genotypic_superiority_measure(
 data = Data,
 trait = "Yield",
 genotype = "Genotype",
 environment = "Environment",
 unit.correct = FALSE)